1. Electronics Materials Lab, College of Science and Engineering, James Cook University, Townsville, Queensland 4811, Australia
2. Research School of Electrical, Energy and Materials Engineering, The Australian National University, Canberra, Australian Capital Territory 2601, Australia
3. Plasma Sources and Application Centre/Space Propulsion Centre Singapore, NIE, Nanyang Technological University, Singapore 637616, Singapore
4. Nanomaterials and Devices Laboratory, Department of Physics, University of Houston, Houston, Texas 77204, United States
5. Mechanical Engineering Technology, College of Technology, University of Houston, Houston, Texas 77204, United States